[UA-EAI] Using search engine translators on unfamiliar email addresses

[John Levine]

In article <c7a2dc25-8dca-1ac9-6e10-a8e5a1cd5720 at governanceprimer.com> you write:
>
>My ultimate question is, other than using aliases, what is our 
>recommendation as a group to people implementing/using these different 
>scripts who for whatever reason want to send emails from an address with 
>Han characters to ASCII counterparts? 

"Don't do that."

If the recipient's system supports EAI, a Han address will work.  If it doesn't,
you need to use an ASCII address.

There's the separate issue of how to tell whether a system with an
ASCII address supports EAI. You can check whether its MTA offers
SMTPUTF8 but it's still possible that even so something behind the MTA
doesn't handle it.  I don't see any good solutions beyond heuristics like
if someone sent you EAI mail they can receive it, and anything hosted at
Gmail or Outlook.com can handle EAI.

R's,
John